"OS X 10.9, which is internally codenamed 'Cabernet', will focus on various 'power-user' enhancements and take core features from iOS, according to our sources. Unlike operating system updates such as OS X Leopard and OS X Lion, OS X 10.9 will likely not be an overhauled approach to how the operating system feels and functions." Features for power users and features from iOS? Seems like an oxymoron. Still, if they manage to finally fix the Finder and Spaces, I'll be happy.

The article was referring to multi monitor handling of fullscreened apps. In OS X, if you fullscreen an app, it will spawn a new space (virtual desktop) and fill the screen in that space. It's a neat window management shortcut for devices with small screens (laptops) since you can quickly swipe between spaces in OS X. On my MacBook Air, I always fullscreen a terminal window so that it's always just a couple of swipes (or keystrokes) away.

However, with a multi monitor setup, fullscreening an app will cause the app to take over the current monitor, leaving the other monitors with nothing on them. One could argue that a user with multiple monitors doesn't really need to fullscreen an app since they have enough screen real estate to play with. Maximizing an app should be plenty enough. However, this behaviour is broken, and should be fixed.